straiten

kiristää

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To make strait; to narrow or confine to a smaller space.

The channel straitened the river through the town, made it flow faster, and caused more flooding upstream.

"And the reason why Birds are Oviparous and lay Eggs, but do not bring forth their yong alive, is, because there might be more plenty of them also, and that neither the Birds of prey, the Serpent nor the Fowler, should streighten their generations too much."

Rising costs put those on fixed incomes in straitened circumstances.